TY - JOUR
T1 - Effect of chemical composition on the flocculation dynamics of latex-based synthetic activated sludge
AU - Nguyen, Tan Phong
AU - Hankins, Nicholas P.
AU - Hilal, Nidal
N1 - Funding Information:
The authors thank the Ministry of Education and Training (MOET) of Vietnam for financial support of TPN during this work, through the Vietnamese Overseas Scholarship Program (VOSP).
PY - 2007/1/10
Y1 - 2007/1/10
N2 - This study investigates the effect of calcium, alginate, fibrous cellulose, and pH on the flocculation dynamics and final properties of synthetic activated sludges. A laboratory-scale batch reactor, fed with standard synthetic sludges was used. The effects of varying calcium concentration (5-25 mM), alginate concentration (25-125 mg/L), fibrous cellulose concentration (0.2-0.8 g/L) and pH (3-9) on the sludge characteristics were studied by varying one parameter whilst keeping the others constant. The results from experiments indicated that the calcium, alginate, fibrous cellulose, and pH had the critical effect on the aggregation rate, flocs size, and made the improvement of the final properties of sludge. Dynamic measurements have established the optimum conditions for floc formation and can accurately reflect the state of formation of the synthetic activated sludge flocs. These correlate well with measurements of settleability and turbidity of the synthetic activated sludge. The results of this study support the bonding theory and indicate that formation of cations-polymer complexes and polymer gelation are important means of flocculation. The development of synthetic activated sludges is suggested also to be a possible surrogate for studying the final properties of activated sludge.
AB - This study investigates the effect of calcium, alginate, fibrous cellulose, and pH on the flocculation dynamics and final properties of synthetic activated sludges. A laboratory-scale batch reactor, fed with standard synthetic sludges was used. The effects of varying calcium concentration (5-25 mM), alginate concentration (25-125 mg/L), fibrous cellulose concentration (0.2-0.8 g/L) and pH (3-9) on the sludge characteristics were studied by varying one parameter whilst keeping the others constant. The results from experiments indicated that the calcium, alginate, fibrous cellulose, and pH had the critical effect on the aggregation rate, flocs size, and made the improvement of the final properties of sludge. Dynamic measurements have established the optimum conditions for floc formation and can accurately reflect the state of formation of the synthetic activated sludge flocs. These correlate well with measurements of settleability and turbidity of the synthetic activated sludge. The results of this study support the bonding theory and indicate that formation of cations-polymer complexes and polymer gelation are important means of flocculation. The development of synthetic activated sludges is suggested also to be a possible surrogate for studying the final properties of activated sludge.
KW - Flocculation dynamics
KW - Malvern Mastersizer-S
KW - Photometric dispersion analyser (PDA)
KW - Sludge properties
KW - Synthetic activated sludge
UR - http://www.scopus.com/inward/record.url?scp=33845467860&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33845467860&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2006.06.025
DO - 10.1016/j.jhazmat.2006.06.025
M3 - Article
C2 - 16839674
AN - SCOPUS:33845467860
SN - 0304-3894
VL - 139
SP - 265
EP - 274
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 2
ER -